Income Taxes - Net Operating Loss Carryforwards (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating loss carryforwards
Valuation allowance	$ 12,493	$ 16,960
Change in valuation allowance	(4,500)
Foreign tax credits	$ 3,782	$ 2,570
Percentage of taxable income	80.00%
Period of foreign tax credit carryforwards	10 years
Federal
Operating loss carryforwards
Net operating loss carryforwards	$ 23,100
State
Operating loss carryforwards
Net operating loss carryforwards	$ 132,600